Subject: Re: cg6 from an ss2 to ss5, ok?
To: der Mouse <mouse@Rodents.Montreal.QC.CA>
From: Kurt J. Lidl <lidl@pix.net>
List: port-sparc
Date: 08/31/2002 20:16:32
On Sat, Aug 31, 2002 at 06:06:53PM +0200, der Mouse wrote:
> >> to my knowledge the cg6 will work in any SBus machine, end of
> >> sentence.
> > Any cg6 will work in any pre-ultrasparc sbus machine.(*)
> > [...] electrical incompatibility [...]
>
> Anybody know what the "electrical incompatability" is?
I remember it being described as a "capacitance issue".
There is some text describing some of the limitations in
the old "Sun Framebuffer FAQ" document that is floating
around at various FAQ sites. A recent (I think) copy
is here:
http://bul.eecs.umich.edu/~crowej/sunfaq/FrameBuffer.html
In particular, the "What frame buffers are/are not
support in the Ultra machines?" question is relevant.
> In particular, what are the symptoms if I try to use an incompatible
> card?
They just don't work.
> And is it liable to fry anything?
Empirical testing says they don't fry, either.
> Is there any similar incompatibility in the other direction
> (new cards, old SBus)?
Not that I have heard of.
-Kurt